当前位置: X-MOL 学术Chem. Eng. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Facile synthesis of tetragonal NaV2O5·H2O nanosheets co-intercalated by high content of Na+ and H2O for boosted lithium storage
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.cej.2020.126131
Ruizi Li , Jianfeng Huang , Liangliang Feng , Xifei Li , Yu Xia , Liyun Cao , Wenbin Li

NaxV2O5·yH2O have been considered to be very promising electrode materials in the energy storage field by virtue of their V4+/V5+ mixed valences and co-intercalated Na+/H2O. However, the as-reported NaxV2O5·yH2O usually present the low content of Na+ and the anisotropy of Li+ diffusion in the plane direction. Herein, we successfully synthesize a tetragonal NaV2O5·H2O nanosheets co-intercalated by high content of Na+ and H2O via a simple one-step hydrothermal method under broad synthesis conditions, where S2- reductant has been proved to be very significant for its successful synthesis. With the synergistic effect of the isotropy of tetragonal lattice in the plane direction, and the co-intercalated high content of Na+ and H2O, NaV2O5·H2O nanosheets as anode material for lithium-ion batteries exhibit excellent electrochemical performance. The initial discharge and charge capacities are up to 859 and 607 mA h g−1 at 100 mA g−1, and the capacity is maintained at 473 mA h g−1 after 500 cycles, which are outperform other reported layered sodium/lithium vanadate, lithium titanate, lithium/titanium niobate and graphite. In addition, we also reveal that the active material during cycling process is the LixNayV2O5·H2O with stable crystal structure and morphology, and the Li+ storage process is coequally determined by diffusion and pseudocapacitive behavior.



中文翻译:

易于合成高含量的Na +和H 2 O共同嵌入的四方NaV 2 O 5 ·H 2 O纳米片,用于增强锂存储

Na x V 2 O 5 · y H 2 O由于它们的V 4+ / V 5+混合价和Na + / H 2 O的共嵌入,在能量存储领域被认为是非常有前途的电极材料。因此,如所报道的,Na x V 2 O 5 ·yH 2 O通常表现出低的Na +含量和Li +在平面方向上的扩散各向异性。在这里,我们成功地合成了四方NaV 2 O 5 ·H 2在宽泛的合成条件下,通过简单的一步水热方法,通过高含量的Na +和H 2 O共嵌入O纳米片,其中S 2-还原剂已证明对于其成功合成非常重要。借助四方晶格在平面方向上的各向同性的协同效应以及Na +和H 2 O的共嵌入高含量,作为锂离子电池负极材料的NaV 2 O 5 ·H 2 O纳米片表现出优异的电化学性能性能。初始充放电容量高达859和607毫安ħ克-1在100mA克-1,在500次循环后,容量保持在473 mA h g -1,优于其他报道的层状钒酸钠/钒酸锂,钛酸锂,铌酸锂/钛和石墨。此外,我们还发现,循环过程中的活性物质是具有稳定晶体结构和形态的Li x Na y V 2 O 5 ·H 2 O,而Li +的存储过程由扩散和拟电容行为共同确定。

更新日期:2020-07-13
down
wechat
bug